．— Are you getting a new apartment this year?

— ________ I can’t afford to pay my bills, let alone buy a new apartment.

A．Don’t mention it．

B．You must be joking．

C．Are you sure?

D．Good idea.

流行性斑疹伤寒的密切接触者应进行医学观察（）

A.7天

B.14天

C.21天

D.10天

E.1个月